Electric-arc lamp.



- w.` H. rnzHueH.

ELECTRIC ARC LAMP.

. (Application led May 11, 1901 Patented luly I6, |901.

(No I odel.)

WUNESSES W n i/{ZNWNTUR JQ/AM lATTDA'AIEY A UNITED STATES PATENT CEEICE.

vTILLIAM H. FITZHUGH, OF BAY CITY, MICHIGAN.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part 0f Letters Patent N O. 678,386, dated. Tilly 16, 1901.

Application filed May 11| 1901l Serial No. 59,720. (No model.)

To all whom, it may concern:

Beit known that l, WILLIAM H. FITZHUGII, a citizen of the United States, residing at Bay City, in the county of Bay and State of Michigan, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, su ch as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to means for converting open-arc lamps of the ordinary type into inclosed l'amps, and has for its object to provide a simple and inexpensive device which can be attached to existing lamps for inclosing the arc in a globe yieldingly held in place by a frame which does not interfere to any appreciable extent with the radiation of light from the arc and can be `quickly swung out of the way to permit removal of the globe when the lamp is to be trimmed.

Another object is to provide a device for supporting th e globe which willr hold it in place with even and uniform pressure regardless of any small unevenness or irregularity.

A further object is to provide a waterproof cap through which the carbon slides that will carry moisture away from the opening, preventing it from entering the globe.

My invention is illustrated in the accom panying drawings, in whiche Figure l is a partial front elevation, partly sectional. Fig. 2 is a partial side elevation showing the frame swung clear of the globe and the globe removed from the lamp. Fig. 3 is a sectional detail of the globe-supporting device, the spring being omitted. Fig. 4 is a diametral section of the frame-supporting ange.

As is clearly shown in the drawings, the device consists in depending rods A, secured at their upper en'ds to the lamp-operating mechanism (not shown in the drawings) and carrying a flange B at their lower ends. Pivotally secured to the under side of the flange B is a U-shaped frame or armV C, which normally hangs in a vertical position, butcan be swung to a horizontal position for removing the globe. An annular globe-retaining fiange lbon-openin g.

B is formed on the under side of the flange B and receives lthe upper open end of the globe D. The lower end of the globe carries a projection D, which is normally supported by a cup E, having a downwardly-projecting central spindle E and an exterior cylindrical shell E2. The lower end of the spindle E is either spherical, cylindrical, or coned. A corresponding depression is formed in the upper end of the supporting-spindle F, which is adjustably mounted in the lower end of the U- shaped bracket C. rIhis supporting-spindle carries a horizontal liange or equivalent pro j ection nearits upper end, and a compressible spring G is interposed between this flange and the under side of the cup E to press the latter upwardly. The shell F.2 conceals the spring and protects ,it from the weather. end of the spindle F rests upon a 'thumbscrew H, by which its vertical height can be adjusted.

The mouth of the globe D is preferably faced off by grinding or otherwise, so as to form a comparatively tight joint with the under side of the ange B. The globeis held in place by the upward pressure of the yielding spring G. It will be noticed that any unevenness in the top of the globe-fiange or in the surface of the ange B is compensated for by the pliant mounting of the frame C and-of the cup E, which coact to produce a practically uniform upward pressure of the globe-flange upon' the flange B and prevents straining the globe unevenly. The spring Gr, furthermore, permits the cup E to yield vertically a sufficient amount to compensate for the expansion of the globe when heated.

A ring of packing B3 can be inserted between the ange of the globe and the under side of the flange B, if desired.

In order to prevent water from entering the globe through the carbon-holes, I form the flange B with a raised central portion B2, through the highest part of which is the car- Any moisture striking the upper surface of the *flange B will How away from the carbon instead of into the opening.

By the means above described I have produced a simple, compact, and inexpensive inclosing device for arc-lamps which can be readily applied to lamps of the type in com- The lower n mon use, is easily operated to remove the globe when renewing the carbons, and does not obstruct the light.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In combination with an arc-lamp; a horizontal flange suspended from the lamp-casing; a depending U-frame pivoted at its upper ends to the under side of said flange; a globe having a single opening at its top and a central projection at its bottom; an adjustingscrew through the lower part of the U -frame a vertical spindle resting on the upper end of said screw and slidably mounted in the lower part of the frame; a second spindle above the first spindle; a compressible spring secured to the lower spindle and yieldingly supporting the upper spindle, substantially as set forth.

2. In combination with an arc-lamp; a horizontal Bange suspended from the lamp-casing; a depending U-frame pivoted at its upper ends to the under side of said flange; a globe having a single opening at its top and a central projection at its bottom; an adjustingscrew through the lower part ofthe U frame; a Vertical spindle resting on the upper end of said screw and slidably mounted in the lower part of the frame; a second spindle above said first spindle; together with a compressible spring secured to the lower spindle and yieldingly supporting the upper spindle.

3. In combination with an arc-lamp; a horizontal fian ge suspended from the lamp-casing; a depending U-frame pivoted at its upper ends to the under side of said flange; a globe having a single opening at its top and a central projection at its bottom; an adjustingscrew through the lower part of the U-frame; a Vertical spindle resting on the upper end of said screw and slidably mounted in the lower part of the frame, said spindle being cupped at its upper end; a second spindle above said rst spindle, having a recess in its upper end to receive the projection of the globe; together with a compressible spring secured to the lower spindle and yieldingly supporting the upper spindle, substantially as described and for the purpose set forth.

4. Incombination withanarc-lamp; ahorizontal flange suspended from the lam p-casing; a depending U-frame pivoted at its upper ends to the under side of said flange; a globe having a vsingle opening at its top and a central projection at its bottom; an adjustingscrew through the lower part of the U-frame; a vertical spindle resting on the upper end of said screw and slidably mounted in the lower part of the frame, said spindle being cupped at its upper end; a second spindle above said first spindle, having a recess in its upper end to receive the projection of the globe and having a projection on its lower end above the cupped end of the first spindle; together with a compressible spring secured to the lower spindle and yieldingly supporting the upper spindle, substantially as described and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM H. FITZHUGH.

Vitnesses:

I. GoULD, E. F. WARREN. 

